Re: [igraph] Bug report

From:

Gabor Csardi

Subject:

Re: [igraph] Bug report

Date:

Sat, 9 Feb 2008 11:00:42 +0100

User-agent:

Mutt/1.5.13 (2006-08-11)

David, thanks for the report, i agree that this is a bug,
either in the code, or in the documentation.
I'll correct it in a minute.
G.
On Sat, Feb 09, 2008 at 01:43:35AM +0100, David Morton EPFL wrote:
> Hello,
> I just wanted to point out a little bug I've run into recently with the
> graph.adjacency function.
>
> start with
> m <- matrix(c(0,1,1,0),nrow=2)
> then
> graph.adjacency(m, mode="undirected")
> works fine, but
> g <- graph.adjacency(m, mode="undirected",weighted=TRUE)
> doubles every non-loop edges in g. For example
> get.adjacency(g)
> would output
> 0 2
> 2 0
> instead of
> 0 1
> 1 0
> This problem occurs for any symmetric m.
> I run up-to-date versions of igraph and R on both Linux and Windows systems.
>
> Anyway, congratulations for igraph. It is a great and powerful software I use
> constantly.
> Cheers!
>
> --
> David Morton de Lachapelle
> _______________________________________________
> igraph-help mailing list
> address@hidden
>http://lists.nongnu.org/mailman/listinfo/igraph-help
--
Csardi Gabor <address@hidden> UNIL DGM